/**
 * Copyright 2008 Mathias Doenitz, http://lis.to/
 *
 * This file is part of the lis.to java desktop client. The lis.to java desktop client is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * The lis.to java desktop client is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with the lis.to java desktop client.
 * If not, see http://www.gnu.org/licenses/
 */

package listo.client.dragdrop;

import org.apache.commons.lang.ArrayUtils;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;

public abstract class AbstractSelection implements Transferable {

    public DataFlavor[] flavors;

    private final Object selection;

    protected AbstractSelection(Object selection) {
        this.selection = selection;
    }

    protected static DataFlavor createDataFlavor(String mimeType) {
        try {
            return new DataFlavor(mimeType);
        }
        catch (ClassNotFoundException e) {
            throw new IllegalStateException();
        }
    }

    protected abstract DataFlavor[] createDataFlavors();

    public DataFlavor[] getTransferDataFlavors() {
        if (flavors == null) {
            flavors = createDataFlavors();
        }
        return flavors;
    }

    public boolean isDataFlavorSupported(DataFlavor flavor) {
        return ArrayUtils.contains(flavors, flavor);
    }

    public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
        if (!isDataFlavorSupported(flavor)) throw new UnsupportedFlavorException(flavor);
        return selection;
    }

}